关键词: 煤气化渣, 视密度, 炭-灰分离, 水介质旋流器

Abstract: The gasification of coal produced large quantity of slags, which results in serious envieonmental problems. The comprehensive utilization of gasification slag has become an urgent issue. In this paper, the characteristics of different density components in coal gasification slag were systematically analyzed, which indicates that the separation of carbon and ash is the premise and foundation for the utilization of coal gasification slag. A method of carbon-ash separation based on the apparent density difference is proposed. Water-only cyclone was used to realize the separation and single factor tests were carried out as to the influence of the main process parameters on the separation effect of carbon and ash, which proved the feasibility of the water-only cyclone for +0.074mm carbon-ash separation. By means of Box-Behnken Design, the quantitative relationship between the cone angle of the water-only cyclone, the apex diameter, the vortex finder depth and the ash content, the yield and the comprehensive efficiency of separation is analyzed, which provides data support both for the prediction of the carbon-ash separation effect and the determiation of water-only structural parameters. The results has guiding significance for the utilization of coal gasification slag.

Key words: coal gasification slag, apparent density, carbon-ash separation, water-only cyclone